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Using several nodes in a simulation (OpenFOAM) |
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December 2, 2019, 04:35 |
Using several nodes in a simulation (OpenFOAM)
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New Member
Join Date: Aug 2019
Posts: 19
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Dear all,
I'm quite new in using OpenFOAM in a cluster, using only one node is a breeze... the problem starts when I need to use more than one node... I'm using the command 'mpirun --host node1,node2 -np 48 rhoSimpleFoam -parallel' and I get the following info/error There are not enough slots available in the system to satisfy the 48 slots that were requested by the application: rhoSimpleFoam Either request fewer slots for your application, or make more slots available for use. A "slot" is the Open MPI term for an allocatable unit where we can launch a process. The number of slots available are defined by the environment in which Open MPI processes are run: 1. Hostfile, via "slots=N" clauses (N defaults to number of processor cores if not provided) 2. The --host command line parameter, via a ":N" suffix on the hostname (N defaults to 1 if not provided) 3. Resource manager (e.g., SLURM, PBS/Torque, LSF, etc.) 4. If none of a hostfile, the --host command line parameter, or an RM is present, Open MPI defaults to the number of processor cores In all the above cases, if you want Open MPI to default to the number of hardware threads instead of the number of processor cores, use the --use-hwthread-cpus option. Alternatively, you can use the --oversubscribe option to ignore the number of available slots when deciding the number of processes to launch. I'm doing something wrong, please help... OpenFOAM - v1906 |
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Tags |
mpirun, nodes, openfoam |
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